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  #271  
Old 12-28-2015, 12:10 PM
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Default Re: 1:350 TOS Light Cruiser

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Originally Posted by SCI-FI View Post
w00t!
Updates again- it's a late Christmas present!

How much do you deviate from your concept sketch to the practical model? And what drives the changes? (I'm assuming the answer is "How much of a pain the butt this next scribing would be...")
Best-
Merry New Year!

On deviation, I'm assuming you're referring to the whole model and not just the scribing pattern. It really depends on how well thought-out my original plans were prepared and the speed I need to make it happen. In this case, I had spent some long hours in developing the Sentinel on paper to where I was satisfied with most of the aspects. Of course, being both designer and builder, I've got free reign to change things as I go to improve areas I wasn't 100% happy with. It really is a challenge to re-create something in three dimensions to conform to something you designed in only two. But deviation can be fun. New details brought about by spontaneity bring a fresh perspective to plan already "set in stone".

In terms of the scribe pattern, I did stay pretty close to the plans but added a few new things for added detail. The rings around the docking ports and where they tie into a horizontal Deck-level panel line echo forward to a TMP look.
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  #272  
Old 12-29-2015, 05:53 PM
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Default Re: 1:350 TOS Light Cruiser

Continuing on what seems more of the same boring stuff. Progress Updates Soldier on…

The photon torpedo tubes were drilled and filled with brass tubing on the lower primary "hump".

Originally, the plans called for the photon tubes above and on either side of the main sensor on the secondary hull. This proved to be a little too close for comfort to clearing the primary hull directly in front of it. I may still install tubular shapes in this position as possible tractor beam emitters.





The Big Milestone was the casting of the secondary hull master.

This was begun by surrounding one half of the master in clay and then walled in foam core. The exposed half was then covered in Smooth-On silicone rubber. Once cured, the walls were removed, mold flipped upside down and clay peeled off. Leaving the master in the mold and spritzing the rubber and master in mold release, the wall was reset and filled with more rubber.





After the mold cured completely, the walls were removed again, rubber carefully pried apart and master removed. To cast, a mixture of SmoothCast 300 resin was poured into one half of the mold. The other half was quickly placed over the first and rubber banded together as I rotated the mold by hand in all directions as the resin cured. This resin cures in about 4-6 minutes so you have to work pretty fast. The first casting came out pretty good but the bulk of resin had settled too much towards the top and the skin thickness was too thin along the sides. Adding a little more resin to the second casting and concentrating the rotation to the hull sides insured a much more even Lucky #2 cast.



The main sensor shroud was also cast in resin:

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Last edited by AdmiralBuck; 08-14-2017 at 08:56 AM.
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  #273  
Old 12-29-2015, 05:58 PM
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Default Re: 1:350 TOS Light Cruiser

Looks like you didn't even have to do that much cleanup on the casting. Very nice.

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  #274  
Old 12-30-2015, 11:03 AM
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Default Re: 1:350 TOS Light Cruiser

Sweet.
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  #275  
Old 12-30-2015, 01:54 PM
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Default Re: 1:350 TOS Light Cruiser

Awesome mold, awesome pics, and most importantly, awesome write-up.

Many thanks for the ongoing education!

Best-
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  #276  
Old 12-30-2015, 03:03 PM
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Thumbs up Re: 1:350 TOS Light Cruiser

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Originally Posted by SCI-FI View Post
Awesome mold, awesome pics, and most importantly, awesome write-up.

Many thanks for the ongoing education!

Best-
Thanks! I appreciate your interest in the project. It helps motivate me to continue.
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  #277  
Old 12-31-2015, 04:11 PM
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Default Re: 1:350 TOS Light Cruiser

Love your progress!
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  #278  
Old 12-31-2015, 04:52 PM
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Default Re: 1:350 TOS Light Cruiser

Fantastic.
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  #279  
Old 12-31-2015, 08:07 PM
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Default Re: 1:350 TOS Light Cruiser

Thank you gentlemen!!
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  #280  
Old 01-01-2016, 05:59 PM
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Default Re: 1:350 TOS Light Cruiser

The resin cast secondary hull ports were marked and drilled out for the usual method of reframing them in 3/32 x 3/16 rectangular brass tubing. These were cut into 1/8" segments and superglued into position, later filing flush to the surface. Both port and starboard sides took two full days to complete. 44 ports total.



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Last edited by AdmiralBuck; 08-14-2017 at 08:58 AM.
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  #281  
Old 01-01-2016, 07:00 PM
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Default Re: 1:350 TOS Light Cruiser

The amount of work to do all that boggles the mind.
1) How do you ensure they are all parallel?
2) Does this mean that Production Mk 1 is now the "true" master?

Edit: whoops, I asked a version of question 1 back on 29 Nov, answered on 30 Nov. I rescind, unless there is some new technique behind this aspect of the project...

Last edited by SCI-FI; 01-01-2016 at 07:06 PM.
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  #282  
Old 01-01-2016, 08:26 PM
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Default Re: 1:350 TOS Light Cruiser

Quote:
Originally Posted by SCI-FI View Post
The amount of work to do all that boggles the mind.
1) How do you ensure they are all parallel?
2) Does this mean that Production Mk 1 is now the "true" master?

Edit: whoops, I asked a version of question 1 back on 29 Nov, answered on 30 Nov. I rescind, unless there is some new technique behind this aspect of the project...
1) Horizontal reference lines are penciled on the hull and a paper window template is traced to both sides.

2) Right, the "Production Mk 1" is now the actual model part as a hollow cast resin hull.
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  #283  
Old 01-01-2016, 09:18 PM
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Default Re: 1:350 TOS Light Cruiser

Very nice- very clean too.
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  #284  
Old 01-03-2016, 07:43 PM
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Default Re: 1:350 TOS Light Cruiser

Thank you Mr Warrior!

The production hull components were test fitted along with the armature. Some modifications were needed to allow the armature to fit properly within the hull. It was necessary to revise the aft end of the brass frame.



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Last edited by AdmiralBuck; 08-14-2017 at 09:00 AM.
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  #285  
Old 01-04-2016, 12:29 AM
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Default Re: 1:350 TOS Light Cruiser

so we've seen the moulding process, how did you hollow cast it?


Oh and any news on when you are getting your Nacelles?
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